New method for simultaneous measurement of frequency spectra of complex dielectric constants of polyelectrolyte solutions

Shin'ichiro Umemura, Reinosuke Hayakawa, Yasaku Wada

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A high-speed and high-accuracy measurement of relaxational frequency spectra of complex dielectric constants of polyelectrolyte solutions with a high conductivity was realized by a new digital signal processing technique. In this method, a sum of sinusoidal waves of geometrical series of frequencies is utilized as a multifrequency excitation signal and demodulation of the resulting response is carried out simply by addition and subtraction of digital signals in a minicomputer. This new technique is superior to the conventional cross correlation method using the fast Fourier transform in that it greatly reduces the processing time and avoids effectively the influence of a quantization error. The result for a DNA solution obtained by this method is presented to demonstrate the utility of this method.

Original languageEnglish
Pages (from-to)317-320
Number of pages4
JournalBiophysical Chemistry
Volume11
Issue number3-4
DOIs
Publication statusPublished - 1980 Jun

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Organic Chemistry

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